HAProxy is free, open-source software that provides a high-availability load balancer and proxy server for TCP and HTTP-based applications that spreads requests across multiple servers.
It is written in C and has a reputation for being extremely fast and efficient also in terms of processor and memory usage.
HAProxy is used by a number of high-profile websites including GitHub, Bitbucket, Stack Overflow, Reddit, Speedtest.net, Tumblr, Twitter, and Tuenti, and is used in the OpsWorks product from the largest cloud providers.
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